Improvement in circular-saw mills



i. dint WNW VlCTOR H. B USCHM ANN, OF BALTIMORE, MARYLAND.

Letters Patent No. 86,358, (lated Febr'uwry 2, 1869; antcdated January20, 1869.

IMPRO'EMENT IN CIRCULAR-SAW MILLS.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concer/n:

Be itknown that I, Vro'ron H. BUscHMANN, of the city and county ofBaltimore, and State of Maryland, have invented certain new and usefulImprovements in Feeding-Devices for Sawing-Machines; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, making a partof `this speciiication, in which- Figure 1 is a front elevation of theimproved feedrollers, and their supporting-frame.

Figure 2 is a longitudinal section, taken in a vertical plan throughtheucentre of the feeding-device.

Figure 3 is a section taken through the device in the horizontal planeindicated by dotted line in ig. 2, representing, in red lines, aboard'on its way between the rollers to the saw.

Similar letters of reference indicate corresponding parts in the severalgures.

The invention relates to a new and improved mode of adjusting andsetting feeding and guiding-rollers of machinery which is designed forsplitting or resawing thick boards. l

The invention is an improvement on the adj ustingdevices described inthe Letters Patent which were granted to me on the 8th day of December,1863, and also on the 18th day of April, 1865.

It consists in hanging feed and guide-rollers in laterally-adjustableyielding frames, 4and in connecting said frames together by means ofendwise-adjustable rods, applied to loaded levers, which latter havetheir axes of motion in a vertical plane of the saw, as will behereinafter explained, whereby the said feedingand guiding-rollers canbe adjusted, and set to press uniformly on both si'des of boardsA passedbetween them to the saw, as will be understood from the followingdescription.

To enable others skilled in the art to understand invention, I willdescribe its construction and operation.

The main supporting-frame for the feeding and guidin g-devices consistsof four upright standards, connected together by horizontal beams A A.

Between the cross-beams A1 A'l are two laterally-zuljustable frames,each one of which is composed of horizontal beams, connected together byupright pieces B, and prevented from undue longitudinal play by means ofstuds t', or in any other suitable manner.

These two laterally-movable frames are adapted for carrying thefeed-rollers C C', and also the guide-rlillers The feed-rollers C C maybe rotated by means of a right-and-left screw-rod, on spur-wheels,precisely as described in my Letters Patent above referred to, or theymay be rotated in any other suit-able manner.

Between the two roller-carrying frames, I secure, in horizontalpositions, two rods g g, one of which is secured to the top beams A ofthe main frame, and the other is secured to the bottom beams A2 of thisframe.

Both ofthe rods g g are in the same vertical plane, and both are in aplane coinciding with that'of the saw which is intended for sawing theboards passed between the rollers.

These rods are intended to serve as the fulcra for two pairs of levers DD', which carry weights WV W upon them, and which are connected togetherby rods W W', as shown in the drawings.

The said levers extend out laterally from the main frame, and are guidedby means of staple-guides a a, on said frame. They are applied in frontand in rear of the two pairs of rollers, so as to act upon the upper andlower ends of the roller-carrying frames, in front and rear thereof, forthe purpose of keeping the two pairs of rollers pressed against thesides of boards which are being fed up to the saw.

The inner ends d d ofthe four loaded levers are bent downward, andreceive through them the fixed rods g g, which forni pivotal connectionsfor said levers` The roller-carrying frames are connected to the bentportions d d ofthe levers D D, by means of short rods or links, each oneof which is composed of two short seetions c c, having a right-and-leftscrew or turn-buckle, b, tapped into their ends, as shown in figs. 1 and3.

These links are pivoted to their respective bent por,- tions of theloaded levers, at equal distances o n each side of the fulcra of suchlevers, and the outer ends of said links are pivoted to eye-pieces orstuds upon the roller-carrying frames, in the manner shown in thedrawings.

Two adjustable connecting-links are applied to each one of the loadedlevers, and each one of the four con i ners of each roller-carryingframe is thus connected to one of the loaded levers.

When the roller-carrying frames are arranged, connected together, andconnected to loaded levers, as above described, each pair of rollerswill be acted upon by a weight, XV, which will operate to press themtoward each other, and when there is nothing interposed between them,they will meet exactly in a plane coinciding with the centre of the saw.

The feed and guide-rollers are set for boards which are of an equalthickness on both edges, by adjusting the four screws b of each pair ofrollers until the axes of these rollers are parallel to each other, andequal distances on both sides of a vertical plane, intersecting the axesof the rods g g.

When thus adj usted, and a board is passed between the rollers, theywill spread apart equally on bothsides ofthe vertical centre of suchboard, and conduct itup to the work of being sawed, so that the saw willdivide it equally.

For clapboards, or boards which are designed to be thicker on' one edgethan on the opposite edge, the upper or the lower ends of the feed andguide-rollers are set oif on each side of the plane of the saw, byadjust ing the nuts *b l).

The adjustment of the feeding and guiding-rollers of the machines whichwere secured to me by Letters Patent aforementioned, was eectedby meansof setescrews, against which loaded levers acted, which levers wereactedupon by a weight or weights, arranged centrally below the rollers.

which are applied between roller-carrying adjustable frames,substantially as described.

2. Connecting adjustable roller-carrying 'alnes at top and bottom, bymeans of levers D D', d d', and rods c, and links b', substantially inthe manner and for the4 purpose described.

l 3. The application of the extensible rods c c and b to roller-carryingframes B B and to levers D D or D D D- D, substantially in tlie mannerand for the purpose described.

Witness my hand, in mattei of my applicationfor a patent for aresawing-machine.

Witnesses: VICTOR H. BUSOHMAN N R. T. CAMPBELL, J V. CAMPBELL.

